Kamui square Chalk Shark Magnetic Chalk Holder is constructed with two very powerful rare earth neodymium magnets that are used to produce an ultra-strong attachment. One magnet is embedded within the leather construction of the pocket clip and another magnet is installed in the bottom section of the molded chalk holder. Comes in its very own shark tank! Inside is a mini booklet sharing the story about the designer and the design of the Chalk Shark.